Added missing tegra files.HEADmaster

4 files changed, 1884 insertions, 0 deletions

diff --git a/drivers/staging/ath6kl/hif/common/hif_sdio_common.h b/drivers/staging/ath6kl/hif/common/hif_sdio_common.h
new file mode 100644
index 00000000000..93a2adceca3
--- /dev/null
+++ b/drivers/staging/ath6kl/hif/common/hif_sdio_common.h
@@ -0,0 +1,87 @@
+//------------------------------------------------------------------------------
+// Copyright (c) 2009-2010 Atheros Corporation.  All rights reserved.
+// 
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// common header file for HIF modules designed for SDIO
+//
+// Author(s): ="Atheros"
+//==============================================================================
+
+#ifndef HIF_SDIO_COMMON_H_
+#define HIF_SDIO_COMMON_H_
+
+    /* SDIO manufacturer ID and Codes */
+#define MANUFACTURER_ID_AR6002_BASE        0x200
+#define MANUFACTURER_ID_AR6003_BASE        0x300
+#define MANUFACTURER_ID_AR6K_BASE_MASK     0xFF00
+#define FUNCTION_CLASS                     0x0
+#define MANUFACTURER_CODE                  0x271    /* Atheros */
+
+    /* Mailbox address in SDIO address space */
+#define HIF_MBOX_BASE_ADDR                 0x800
+#define HIF_MBOX_WIDTH                     0x800
+#define HIF_MBOX_START_ADDR(mbox)               \
+   ( HIF_MBOX_BASE_ADDR + mbox * HIF_MBOX_WIDTH)
+
+#define HIF_MBOX_END_ADDR(mbox)                 \
+    (HIF_MBOX_START_ADDR(mbox) + HIF_MBOX_WIDTH - 1)
+
+    /* extended MBOX address for larger MBOX writes to MBOX 0*/
+#define HIF_MBOX0_EXTENDED_BASE_ADDR       0x2800
+#define HIF_MBOX0_EXTENDED_WIDTH_AR6002    (6*1024)           
+#define HIF_MBOX0_EXTENDED_WIDTH_AR6003    (18*1024)   
+
+    /* version 1 of the chip has only a 12K extended mbox range */
+#define HIF_MBOX0_EXTENDED_BASE_ADDR_AR6003_V1  0x4000
+#define HIF_MBOX0_EXTENDED_WIDTH_AR6003_V1      (12*1024)  
+
+    /* GMBOX addresses */
+#define HIF_GMBOX_BASE_ADDR                0x7000
+#define HIF_GMBOX_WIDTH                    0x4000
+
+    /* for SDIO we recommend a 128-byte block size */
+#define HIF_DEFAULT_IO_BLOCK_SIZE          128
+
+    /* set extended MBOX window information for SDIO interconnects */
+static INLINE void SetExtendedMboxWindowInfo(u16 Manfid, struct hif_device_mbox_info *pInfo)
+{
+    switch (Manfid & MANUFACTURER_ID_AR6K_BASE_MASK) {                   
+        case MANUFACTURER_ID_AR6002_BASE :
+                /* MBOX 0 has an extended range */
+            pInfo->MboxProp[0].ExtendedAddress = HIF_MBOX0_EXTENDED_BASE_ADDR;             
+            pInfo->MboxProp[0].ExtendedSize = HIF_MBOX0_EXTENDED_WIDTH_AR6002;
+            break;
+        case MANUFACTURER_ID_AR6003_BASE :
+                /* MBOX 0 has an extended range */
+            pInfo->MboxProp[0].ExtendedAddress = HIF_MBOX0_EXTENDED_BASE_ADDR_AR6003_V1;             
+            pInfo->MboxProp[0].ExtendedSize = HIF_MBOX0_EXTENDED_WIDTH_AR6003_V1;
+            pInfo->GMboxAddress = HIF_GMBOX_BASE_ADDR;
+            pInfo->GMboxSize = HIF_GMBOX_WIDTH;
+            break;
+        default:
+            A_ASSERT(false);
+            break;
+    }
+}
+             
+/* special CCCR (func 0) registers */
+
+#define CCCR_SDIO_IRQ_MODE_REG         0xF0        /* interrupt mode register */
+#define SDIO_IRQ_MODE_ASYNC_4BIT_IRQ   (1 << 0)    /* mode to enable special 4-bit interrupt assertion without clock*/ 
+                        
+#endif /*HIF_SDIO_COMMON_H_*/
diff --git a/drivers/staging/ath6kl/hif/sdio/linux_sdio/include/hif_internal.h b/drivers/staging/ath6kl/hif/sdio/linux_sdio/include/hif_internal.h
new file mode 100644
index 00000000000..ed7ad4786f5
--- /dev/null
+++ b/drivers/staging/ath6kl/hif/sdio/linux_sdio/include/hif_internal.h
@@ -0,0 +1,131 @@
+//------------------------------------------------------------------------------
+// <copyright file="hif_internal.h" company="Atheros">
+//    Copyright (c) 2004-2010 Atheros Corporation.  All rights reserved.
+// 
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// internal header file for hif layer
+//
+// Author(s): ="Atheros"
+//==============================================================================
+#ifndef _HIF_INTERNAL_H_
+#define _HIF_INTERNAL_H_
+
+#include "a_config.h"
+#include "athdefs.h"
+#include "a_osapi.h"
+#include "hif.h"
+#include "../../../common/hif_sdio_common.h"
+#include <linux/scatterlist.h>
+#define HIF_LINUX_MMC_SCATTER_SUPPORT
+
+#define BUS_REQUEST_MAX_NUM                64
+
+#define SDIO_CLOCK_FREQUENCY_DEFAULT       25000000
+#define SDWLAN_ENABLE_DISABLE_TIMEOUT      20
+#define FLAGS_CARD_ENAB                    0x02
+#define FLAGS_CARD_IRQ_UNMSK               0x04
+
+#define HIF_MBOX_BLOCK_SIZE                HIF_DEFAULT_IO_BLOCK_SIZE
+#define HIF_MBOX0_BLOCK_SIZE               1
+#define HIF_MBOX1_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+#define HIF_MBOX2_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+#define HIF_MBOX3_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+
+typedef struct bus_request {
+    struct bus_request *next;       /* link list of available requests */
+    struct bus_request *inusenext;  /* link list of in use requests */
+    struct semaphore sem_req;
+    u32 address;               /* request data */
+    u8 *buffer;
+    u32 length;
+    u32 request;
+    void *context;
+    int status;
+    struct hif_scatter_req_priv *pScatterReq;      /* this request is a scatter request */
+} BUS_REQUEST;
+
+struct hif_device {
+    struct sdio_func *func;
+    spinlock_t asynclock;
+    struct task_struct* async_task;             /* task to handle async commands */
+    struct semaphore sem_async;                 /* wake up for async task */
+    int    async_shutdown;                      /* stop the async task */
+    struct completion async_completion;          /* thread completion */
+    BUS_REQUEST   *asyncreq;                    /* request for async tasklet */
+    BUS_REQUEST *taskreq;                       /*  async tasklet data */
+    spinlock_t lock;
+    BUS_REQUEST *s_busRequestFreeQueue;         /* free list */
+    BUS_REQUEST busRequest[BUS_REQUEST_MAX_NUM]; /* available bus requests */
+    void     *claimedContext;
+    HTC_CALLBACKS htcCallbacks;
+    u8 *dma_buffer;
+    struct dl_list      ScatterReqHead;                /* scatter request list head */
+    bool       scatter_enabled;               /* scatter enabled flag */
+    bool   is_suspend;
+    bool   is_disabled;
+    atomic_t   irqHandling;
+    HIF_DEVICE_POWER_CHANGE_TYPE powerConfig;
+    const struct sdio_device_id *id;
+};
+
+#define HIF_DMA_BUFFER_SIZE (32 * 1024)
+#define CMD53_FIXED_ADDRESS 1
+#define CMD53_INCR_ADDRESS  2
+
+BUS_REQUEST *hifAllocateBusRequest(struct hif_device *device);
+void hifFreeBusRequest(struct hif_device *device, BUS_REQUEST *busrequest);
+void AddToAsyncList(struct hif_device *device, BUS_REQUEST *busrequest);
+
+#ifdef HIF_LINUX_MMC_SCATTER_SUPPORT
+
+#define MAX_SCATTER_REQUESTS             4
+#define MAX_SCATTER_ENTRIES_PER_REQ      16
+#define MAX_SCATTER_REQ_TRANSFER_SIZE    32*1024
+
+struct hif_scatter_req_priv {
+    struct hif_scatter_req     *pHifScatterReq;  /* HIF scatter request with allocated entries */   
+    struct hif_device          *device;          /* this device */
+    BUS_REQUEST         *busrequest;      /* request associated with request */
+        /* scatter list for linux */    
+    struct scatterlist  sgentries[MAX_SCATTER_ENTRIES_PER_REQ];   
+};
+
+#define ATH_DEBUG_SCATTER  ATH_DEBUG_MAKE_MODULE_MASK(0)
+
+int SetupHIFScatterSupport(struct hif_device *device, struct hif_device_scatter_support_info *pInfo);
+void CleanupHIFScatterResources(struct hif_device *device);
+int DoHifReadWriteScatter(struct hif_device *device, BUS_REQUEST *busrequest);
+
+#else  // HIF_LINUX_MMC_SCATTER_SUPPORT
+
+static inline int SetupHIFScatterSupport(struct hif_device *device, struct hif_device_scatter_support_info *pInfo)
+{
+    return A_ENOTSUP;
+}
+
+static inline int DoHifReadWriteScatter(struct hif_device *device, BUS_REQUEST *busrequest)
+{
+    return A_ENOTSUP;
+}
+
+#define CleanupHIFScatterResources(d) { }
+
+#endif // HIF_LINUX_MMC_SCATTER_SUPPORT
+
+#endif // _HIF_INTERNAL_H_
+
diff --git a/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif.c b/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif.c
new file mode 100644
index 00000000000..5f5d67720fa
--- /dev/null
+++ b/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif.c
@@ -0,0 +1,1273 @@
+//------------------------------------------------------------------------------
+// <copyright file="hif.c" company="Atheros">
+//    Copyright (c) 2004-2010 Atheros Corporation.  All rights reserved.
+// 
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// HIF layer reference implementation for Linux Native MMC stack
+//
+// Author(s): ="Atheros"
+//==============================================================================
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sd.h>
+#include <linux/kthread.h>
+
+/* by default setup a bounce buffer for the data packets, if the underlying host controller driver
+   does not use DMA you may be able to skip this step and save the memory allocation and transfer time */
+#define HIF_USE_DMA_BOUNCE_BUFFER 1
+#include "hif_internal.h"
+#define ATH_MODULE_NAME hif
+#include "a_debug.h"
+#include "hw/mbox_host_reg.h"
+
+#if HIF_USE_DMA_BOUNCE_BUFFER
+/* macro to check if DMA buffer is WORD-aligned and DMA-able.  Most host controllers assume the
+ * buffer is DMA'able and will bug-check otherwise (i.e. buffers on the stack).  
+ * virt_addr_valid check fails on stack memory.  
+ */
+#define BUFFER_NEEDS_BOUNCE(buffer)  (((unsigned long)(buffer) & 0x3) || !virt_addr_valid((buffer)))
+#else
+#define BUFFER_NEEDS_BOUNCE(buffer)   (false)
+#endif
+
+/* ATHENV */
+#if defined(CONFIG_PM)
+#define dev_to_sdio_func(d)     container_of(d, struct sdio_func, dev)
+#define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
+#endif /* CONFIG_PM */
+static void delHifDevice(struct hif_device * device);
+static int Func0_CMD52WriteByte(struct mmc_card *card, unsigned int address, unsigned char byte);
+static int Func0_CMD52ReadByte(struct mmc_card *card, unsigned int address, unsigned char *byte);
+
+static int hifEnableFunc(struct hif_device *device, struct sdio_func *func);
+static int hifDisableFunc(struct hif_device *device, struct sdio_func *func);
+OSDRV_CALLBACKS osdrvCallbacks;
+
+int reset_sdio_on_unload = 0;
+module_param(reset_sdio_on_unload, int, 0644);
+
+extern u32 nohifscattersupport;
+
+static struct hif_device *ath6kl_alloc_hifdev(struct sdio_func *func)
+{
+        struct hif_device *hifdevice;
+
+        hifdevice = kzalloc(sizeof(struct hif_device), GFP_KERNEL);
+
+#if HIF_USE_DMA_BOUNCE_BUFFER
+        hifdevice->dma_buffer = kmalloc(HIF_DMA_BUFFER_SIZE, GFP_KERNEL);
+#endif
+        hifdevice->func = func;
+        hifdevice->powerConfig = HIF_DEVICE_POWER_UP;
+        sdio_set_drvdata(func, hifdevice);
+
+        return hifdevice;
+}
+
+static struct hif_device *ath6kl_get_hifdev(struct sdio_func *func)
+{
+        return (struct hif_device *) sdio_get_drvdata(func);
+}
+
+static const struct sdio_device_id ath6kl_hifdev_ids[] = {
+        { SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6002_BASE | 0x0)) },
+        { SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6002_BASE | 0x1)) },
+        { SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x0)) },
+        { SDIO_DEVICE(MANUFACTURER_CODE, (MANUFACTURER_ID_AR6003_BASE | 0x1)) },
+        { /* null */                                         },
+};
+
+MODULE_DEVICE_TABLE(sdio, ath6kl_hifdev_ids);
+
+static int ath6kl_hifdev_probe(struct sdio_func *func,
+                               const struct sdio_device_id *id)
+{
+        int ret;
+        struct hif_device *device;
+        int count;
+
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("ath6kl: Function: 0x%X, Vendor ID: 0x%X, "
+                         "Device ID: 0x%X, block size: 0x%X/0x%X\n",
+                        func->num, func->vendor, func->device,
+                        func->max_blksize, func->cur_blksize));
+
+        ath6kl_alloc_hifdev(func);
+        device = ath6kl_get_hifdev(func);
+
+        device->id = id;
+        device->is_disabled = true;
+
+        spin_lock_init(&device->lock);
+        spin_lock_init(&device->asynclock);
+
+        DL_LIST_INIT(&device->ScatterReqHead);
+
+        /* Try to allow scatter unless globally overridden */
+        if (!nohifscattersupport)
+                device->scatter_enabled = true;
+
+        A_MEMZERO(device->busRequest, sizeof(device->busRequest));
+
+        for (count = 0; count < BUS_REQUEST_MAX_NUM; count++) {
+                sema_init(&device->busRequest[count].sem_req, 0);
+                hifFreeBusRequest(device, &device->busRequest[count]);
+        }
+
+        sema_init(&device->sem_async, 0);
+
+        ret = hifEnableFunc(device, func);
+
+        return ret;
+}
+
+static void ath6kl_hifdev_remove(struct sdio_func *func)
+{
+        int status = 0;
+        struct hif_device *device;
+
+        device = ath6kl_get_hifdev(func);
+        if (device->claimedContext != NULL)
+                status = osdrvCallbacks.
+                        deviceRemovedHandler(device->claimedContext, device);
+
+        if (device->is_disabled)
+                device->is_disabled = false;
+        else
+                status = hifDisableFunc(device, func);
+
+        CleanupHIFScatterResources(device);
+
+        delHifDevice(device);
+}
+
+#if defined(CONFIG_PM)
+static int ath6kl_hifdev_suspend(struct device *dev)
+{
+        struct sdio_func *func = dev_to_sdio_func(dev);
+        int status = 0;
+        struct hif_device *device;
+
+        device = ath6kl_get_hifdev(func);
+
+        if (device && device->claimedContext &&
+            osdrvCallbacks.deviceSuspendHandler) {
+                /* set true first for PowerStateChangeNotify(..) */
+                device->is_suspend = true;
+                status = osdrvCallbacks.
+                        deviceSuspendHandler(device->claimedContext);
+                if (status)
+                        device->is_suspend = false;
+        }
+
+        CleanupHIFScatterResources(device);
+
+        switch (status) {
+        case 0:
+                return 0;
+        case A_EBUSY:
+                /* Hack for kernel in order to support deep sleep and wow */
+                return -EBUSY;
+        default:
+                return -1;
+        }
+}
+
+static int ath6kl_hifdev_resume(struct device *dev)
+{
+        struct sdio_func *func = dev_to_sdio_func(dev);
+        int status = 0;
+        struct hif_device *device;
+
+        device = ath6kl_get_hifdev(func);
+        if (device && device->claimedContext &&
+            osdrvCallbacks.deviceSuspendHandler) {
+                status = osdrvCallbacks.
+                        deviceResumeHandler(device->claimedContext);
+                if (status == 0)
+                        device->is_suspend = false;
+        }
+
+        return status;
+}
+
+static const struct dev_pm_ops ath6kl_hifdev_pmops = {
+        .suspend = ath6kl_hifdev_suspend,
+        .resume = ath6kl_hifdev_resume,
+};
+#endif /* CONFIG_PM */
+
+static struct sdio_driver ath6kl_hifdev_driver = {
+        .name = "ath6kl_hifdev",
+        .id_table = ath6kl_hifdev_ids,
+        .probe = ath6kl_hifdev_probe,
+        .remove = ath6kl_hifdev_remove,
+#if defined(CONFIG_PM)
+        .drv = {
+                .pm = &ath6kl_hifdev_pmops,
+        },
+#endif
+};
+
+/* make sure we only unregister when registered. */
+static int registered = 0;
+
+extern u32 onebitmode;
+extern u32 busspeedlow;
+extern u32 debughif;
+
+static void ResetAllCards(void);
+
+#ifdef DEBUG
+
+ATH_DEBUG_INSTANTIATE_MODULE_VAR(hif,
+                                 "hif",
+                                 "(Linux MMC) Host Interconnect Framework",
+                                 ATH_DEBUG_MASK_DEFAULTS,
+                                 0,
+                                 NULL);
+                                 
+#endif
+
+
+/* ------ Functions ------ */
+int HIFInit(OSDRV_CALLBACKS *callbacks)
+{
+        int r;
+        AR_DEBUG_ASSERT(callbacks != NULL);
+
+        A_REGISTER_MODULE_DEBUG_INFO(hif);
+
+        /* store the callback handlers */
+        osdrvCallbacks = *callbacks;
+
+        /* Register with bus driver core */
+        registered = 1;
+
+        r = sdio_register_driver(&ath6kl_hifdev_driver);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int
+__HIFReadWrite(struct hif_device *device,
+             u32 address,
+             u8 *buffer,
+             u32 length,
+             u32 request,
+             void *context)
+{
+    u8 opcode;
+    int    status = 0;
+    int     ret;
+    u8 *tbuffer;
+    bool   bounced = false;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device: 0x%p, buffer:0x%p (addr:0x%X)\n", 
+                    device, buffer, address));
+
+    do {
+        if (request & HIF_EXTENDED_IO) {
+            //AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Command type: CMD53\n"));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid command type: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_BLOCK_BASIS) {
+            /* round to whole block length size */
+            length = (length / HIF_MBOX_BLOCK_SIZE) * HIF_MBOX_BLOCK_SIZE;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Block mode (BlockLen: %d)\n",
+                            length));
+        } else if (request & HIF_BYTE_BASIS) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Byte mode (BlockLen: %d)\n",
+                            length));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid data mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+#if 0
+        /* useful for checking register accesses */
+        if (length & 0x3) {
+            A_PRINTF(KERN_ALERT"AR6000: HIF (%s) is not a multiple of 4 bytes, addr:0x%X, len:%d\n",
+                                request & HIF_WRITE ? "write":"read", address, length);
+        }
+#endif
+
+        if (request & HIF_WRITE) {
+            if ((address >= HIF_MBOX_START_ADDR(0)) &&
+                (address <= HIF_MBOX_END_ADDR(3)))
+            {
+    
+                AR_DEBUG_ASSERT(length <= HIF_MBOX_WIDTH);
+    
+                /*
+                 * Mailbox write. Adjust the address so that the last byte
+                 * falls on the EOM address.
+                 */
+                address += (HIF_MBOX_WIDTH - length);
+            }
+        }
+
+        if (request & HIF_FIXED_ADDRESS) {
+            opcode = CMD53_FIXED_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Address mode: Fixed 0x%X\n", address));
+        } else if (request & HIF_INCREMENTAL_ADDRESS) {
+            opcode = CMD53_INCR_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Address mode: Incremental 0x%X\n", address));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid address mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_WRITE) {
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (BUFFER_NEEDS_BOUNCE(buffer)) {
+                AR_DEBUG_ASSERT(device->dma_buffer != NULL);
+                tbuffer = device->dma_buffer;
+                    /* copy the write data to the dma buffer */
+                AR_DEBUG_ASSERT(length <= HIF_DMA_BUFFER_SIZE);
+                memcpy(tbuffer, buffer, length);
+                bounced = true;
+            } else {
+                tbuffer = buffer;    
+            }
+#else
+                tbuffer = buffer;
+#endif
+            if (opcode == CMD53_FIXED_ADDRESS) {
+                ret = sdio_writesb(device->func, address, tbuffer, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: writesb ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            } else {
+                ret = sdio_memcpy_toio(device->func, address, tbuffer, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: writeio ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            }
+        } else if (request & HIF_READ) {
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (BUFFER_NEEDS_BOUNCE(buffer)) {
+                AR_DEBUG_ASSERT(device->dma_buffer != NULL);
+                AR_DEBUG_ASSERT(length <= HIF_DMA_BUFFER_SIZE);
+                tbuffer = device->dma_buffer;
+                bounced = true;
+            } else {
+                tbuffer = buffer;    
+            }
+#else
+            tbuffer = buffer;
+#endif
+            if (opcode == CMD53_FIXED_ADDRESS) {
+                ret = sdio_readsb(device->func, tbuffer, address, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: readsb ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            } else {
+                ret = sdio_memcpy_fromio(device->func, tbuffer, address, length);
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: readio ret=%d address: 0x%X, len: %d, 0x%X\n",
+                                                  ret, address, length, *(int *)tbuffer));
+            }
+#if HIF_USE_DMA_BOUNCE_BUFFER
+            if (bounced) {
+                   /* copy the read data from the dma buffer */
+                memcpy(buffer, tbuffer, length);
+            }
+#endif
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid direction: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (ret) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: SDIO bus operation failed! MMC stack returned : %d \n", ret));
+            status = A_ERROR;
+        }
+    } while (false);
+
+    return status;
+}
+
+void AddToAsyncList(struct hif_device *device, BUS_REQUEST *busrequest)
+{
+    unsigned long flags;
+    BUS_REQUEST *async;
+    BUS_REQUEST *active;
+    
+    spin_lock_irqsave(&device->asynclock, flags);
+    active = device->asyncreq;
+    if (active == NULL) {
+        device->asyncreq = busrequest;
+        device->asyncreq->inusenext = NULL;
+    } else {
+        for (async = device->asyncreq;
+             async != NULL;
+             async = async->inusenext) {
+             active =  async;
+        }
+        active->inusenext = busrequest;
+        busrequest->inusenext = NULL;
+    }
+    spin_unlock_irqrestore(&device->asynclock, flags);
+}
+
+
+/* queue a read/write request */
+int
+HIFReadWrite(struct hif_device *device,
+             u32 address,
+             u8 *buffer,
+             u32 length,
+             u32 request,
+             void *context)
+{
+    int    status = 0;
+    BUS_REQUEST *busrequest;
+
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device: %p addr:0x%X\n", device,address));
+
+    do {            
+        if ((request & HIF_ASYNCHRONOUS) || (request & HIF_SYNCHRONOUS)){
+            /* serialize all requests through the async thread */
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Execution mode: %s\n", 
+                        (request & HIF_ASYNCHRONOUS)?"Async":"Synch"));
+            busrequest = hifAllocateBusRequest(device);
+            if (busrequest == NULL) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, 
+                    ("AR6000: no async bus requests available (%s, addr:0x%X, len:%d) \n", 
+                        request & HIF_READ ? "READ":"WRITE", address, length));
+                return A_ERROR;
+            }
+            busrequest->address = address;
+            busrequest->buffer = buffer;
+            busrequest->length = length;
+            busrequest->request = request;
+            busrequest->context = context;
+            
+            AddToAsyncList(device, busrequest);
+            
+            if (request & HIF_SYNCHRONOUS) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: queued sync req: 0x%lX\n", (unsigned long)busrequest));
+
+                /* wait for completion */
+                up(&device->sem_async);
+                if (down_interruptible(&busrequest->sem_req) != 0) {
+                    /* interrupted, exit */
+                    return A_ERROR;
+                } else {
+                    int status = busrequest->status;
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: sync return freeing 0x%lX: 0x%X\n", 
+                                                      (unsigned long)busrequest, busrequest->status));
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: freeing req: 0x%X\n", (unsigned int)request));
+                    hifFreeBusRequest(device, busrequest);
+                    return status;
+                }
+            } else {
+                AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: queued async req: 0x%lX\n", (unsigned long)busrequest));
+                up(&device->sem_async);
+                return A_PENDING;
+            }
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("AR6000: Invalid execution mode: 0x%08x\n", (unsigned int)request));
+            status = A_EINVAL;
+            break;
+        }
+    } while(0);
+
+    return status;
+}
+/* thread to serialize all requests, both sync and async */
+static int async_task(void *param)
+ {
+    struct hif_device *device;
+    BUS_REQUEST *request;
+    int status;
+    unsigned long flags;
+
+    device = (struct hif_device *)param;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task\n"));
+    set_current_state(TASK_INTERRUPTIBLE);
+    while(!device->async_shutdown) {
+        /* wait for work */
+        if (down_interruptible(&device->sem_async) != 0) {
+            /* interrupted, exit */
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task interrupted\n"));
+            break;
+        }
+        if (device->async_shutdown) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async task stopping\n"));
+            break;
+        }
+        /* we want to hold the host over multiple cmds if possible, but holding the host blocks card interrupts */
+        sdio_claim_host(device->func);
+        spin_lock_irqsave(&device->asynclock, flags);
+        /* pull the request to work on */
+        while (device->asyncreq != NULL) {
+            request = device->asyncreq;
+            if (request->inusenext != NULL) {
+                device->asyncreq = request->inusenext;
+            } else {
+                device->asyncreq = NULL;
+            }
+            spin_unlock_irqrestore(&device->asynclock, flags);
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task processing req: 0x%lX\n", (unsigned long)request));
+            
+            if (request->pScatterReq != NULL) {
+                A_ASSERT(device->scatter_enabled);
+                    /* this is a queued scatter request, pass the request to scatter routine which
+                     * executes it synchronously, note, no need to free the request since scatter requests
+                     * are maintained on a separate list */
+                status = DoHifReadWriteScatter(device,request);
+            } else {                
+                    /* call HIFReadWrite in sync mode to do the work */
+                status = __HIFReadWrite(device, request->address, request->buffer,
+                                      request->length, request->request & ~HIF_SYNCHRONOUS, NULL);
+                if (request->request & HIF_ASYNCHRONOUS) {
+                    void *context = request->context;
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task freeing req: 0x%lX\n", (unsigned long)request));
+                    hifFreeBusRequest(device, request);
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task completion routine req: 0x%lX\n", (unsigned long)request));
+                    device->htcCallbacks.rwCompletionHandler(context, status);
+                } else {
+                    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: async_task upping req: 0x%lX\n", (unsigned long)request));
+                    request->status = status;
+                    up(&request->sem_req);
+                }
+            }
+            spin_lock_irqsave(&device->asynclock, flags);
+        }
+        spin_unlock_irqrestore(&device->asynclock, flags);
+        sdio_release_host(device->func);
+    }
+
+    complete_and_exit(&device->async_completion, 0);
+    return 0;
+}
+
+static s32 IssueSDCommand(struct hif_device *device, u32 opcode, u32 arg, u32 flags, u32 *resp)
+{
+    struct mmc_command cmd;
+    s32 err;
+    struct mmc_host *host;
+    struct sdio_func *func;
+
+    func = device->func;
+    host = func->card->host;
+
+    memset(&cmd, 0, sizeof(struct mmc_command)); 
+    cmd.opcode = opcode;
+    cmd.arg = arg;
+    cmd.flags = flags;
+    err = mmc_wait_for_cmd(host, &cmd, 3);
+
+    if ((!err) && (resp)) {
+        *resp = cmd.resp[0];
+    }
+
+    return err;
+}
+
+int ReinitSDIO(struct hif_device *device)
+{
+    s32 err;
+    struct mmc_host *host;
+    struct mmc_card *card;
+        struct sdio_func *func;
+    u8 cmd52_resp;
+    u32 clock;
+
+    func = device->func;
+    card = func->card;
+    host = card->host;
+   
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +ReinitSDIO \n"));
+    sdio_claim_host(func);
+
+    do {
+        if (!device->is_suspend) {
+            u32 resp;
+            u16 rca;
+            u32 i;
+            int bit = fls(host->ocr_avail) - 1;
+            /* emulate the mmc_power_up(...) */
+            host->ios.vdd = bit;
+            host->ios.chip_select = MMC_CS_DONTCARE;
+            host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+            host->ios.power_mode = MMC_POWER_UP;
+            host->ios.bus_width = MMC_BUS_WIDTH_1;
+            host->ios.timing = MMC_TIMING_LEGACY;
+            host->ops->set_ios(host, &host->ios);
+            /*
+             * This delay should be sufficient to allow the power supply
+             * to reach the minimum voltage.
+             */
+            msleep(2);
+
+            host->ios.clock = host->f_min;
+            host->ios.power_mode = MMC_POWER_ON;
+            host->ops->set_ios(host, &host->ios);
+
+            /*
+             * This delay must be at least 74 clock sizes, or 1 ms, or the
+             * time required to reach a stable voltage.
+             */
+            msleep(2);
+
+            /* Issue CMD0. Goto idle state */
+                host->ios.chip_select = MMC_CS_HIGH;
+            host->ops->set_ios(host, &host->ios);
+                msleep(1);
+            err = IssueSDCommand(device, MMC_GO_IDLE_STATE, 0, (MMC_RSP_NONE | MMC_CMD_BC), NULL);
+            host->ios.chip_select = MMC_CS_DONTCARE;
+            host->ops->set_ios(host, &host->ios);
+                msleep(1);
+            host->use_spi_crc = 0;
+
+            if (err) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD0 failed : %d \n",err));    
+                break;
+            }        
+
+            if (!host->ocr) {
+                /* Issue CMD5, arg = 0 */
+                err = IssueSDCommand(device, SD_IO_SEND_OP_COND, 0, (MMC_RSP_R4 | MMC_CMD_BCR), &resp);
+                if (err) {
+                    AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD5 failed : %d \n",err));    
+                    break;
+                }
+                host->ocr = resp;
+            }
+
+            /* Issue CMD5, arg = ocr. Wait till card is ready  */
+            for (i=0;i<100;i++) {
+                err = IssueSDCommand(device, SD_IO_SEND_OP_COND, host->ocr, (MMC_RSP_R4 | MMC_CMD_BCR), &resp);
+                if (err) {
+                    AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD5 failed : %d \n",err));    
+                    break;
+                }
+                if (resp & MMC_CARD_BUSY) {
+                    break;
+                }
+                msleep(10);
+            }
+
+            if ((i == 100) || (err)) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: card in not ready : %d %d \n",i,err));    
+                break;
+            }
+
+            /* Issue CMD3, get RCA */
+            err = IssueSDCommand(device, SD_SEND_RELATIVE_ADDR, 0, MMC_RSP_R6 | MMC_CMD_BCR, &resp);
+            if (err) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD3 failed : %d \n",err));    
+                break;
+            }
+            rca = resp >> 16;
+            host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+            host->ops->set_ios(host, &host->ios);
+
+            /* Issue CMD7, select card  */
+            err = IssueSDCommand(device, MMC_SELECT_CARD, (rca << 16), MMC_RSP_R1 | MMC_CMD_AC, NULL);
+            if (err) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD7 failed : %d \n",err));    
+                break;
+            }
+        }
+        
+        /* Enable high speed */
+        if (card->host->caps & MMC_CAP_SD_HIGHSPEED) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("ReinitSDIO: Set high speed mode\n"));    
+            err = Func0_CMD52ReadByte(card, SDIO_CCCR_SPEED, &cmd52_resp);
+            if (err) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD52 read to CCCR speed register failed  : %d \n",err));    
+                card->state &= ~MMC_STATE_HIGHSPEED;
+                /* no need to break */
+            } else {
+                err = Func0_CMD52WriteByte(card, SDIO_CCCR_SPEED, (cmd52_resp | SDIO_SPEED_EHS));
+                if (err) {
+                    AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD52 write to CCCR speed register failed  : %d \n",err));    
+                    break;
+                }
+                mmc_card_set_highspeed(card);
+                host->ios.timing = MMC_TIMING_SD_HS;
+                host->ops->set_ios(host, &host->ios);
+            }
+        }
+
+        /* Set clock */
+        if (mmc_card_highspeed(card)) {
+            clock = 50000000;
+        } else {
+            clock = card->cis.max_dtr;
+        }
+        
+        if (clock > host->f_max) {
+            clock = host->f_max;
+        }
+        host->ios.clock = clock;
+        host->ops->set_ios(host, &host->ios);
+        
+
+        if (card->host->caps & MMC_CAP_4_BIT_DATA) {
+            /* CMD52: Set bus width & disable card detect resistor */
+            err = Func0_CMD52WriteByte(card, SDIO_CCCR_IF, SDIO_BUS_CD_DISABLE | SDIO_BUS_WIDTH_4BIT);
+            if (err) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("ReinitSDIO: CMD52 to set bus mode failed : %d \n",err));    
+                break;
+            }
+            host->ios.bus_width = MMC_BUS_WIDTH_4;
+            host->ops->set_ios(host, &host->ios);
+        }
+    } while (0);
+
+    sdio_release_host(func);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -ReinitSDIO \n"));
+
+    return (err) ? A_ERROR : 0;
+}
+
+int
+PowerStateChangeNotify(struct hif_device *device, HIF_DEVICE_POWER_CHANGE_TYPE config)
+{
+    int status = 0;
+#if defined(CONFIG_PM)
+        struct sdio_func *func = device->func;
+    int old_reset_val;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +PowerStateChangeNotify %d\n", config));
+    switch (config) {
+       case HIF_DEVICE_POWER_DOWN:
+       case HIF_DEVICE_POWER_CUT:
+            old_reset_val = reset_sdio_on_unload;
+            reset_sdio_on_unload = 1;
+            status = hifDisableFunc(device, func);
+            reset_sdio_on_unload = old_reset_val;
+            if (!device->is_suspend) {
+                struct mmc_host *host = func->card->host;
+                    host->ios.clock = 0;
+                    host->ios.vdd = 0;
+                host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+                host->ios.chip_select = MMC_CS_DONTCARE;
+                host->ios.power_mode = MMC_POWER_OFF;
+                host->ios.bus_width = MMC_BUS_WIDTH_1;
+                host->ios.timing = MMC_TIMING_LEGACY;
+                host->ops->set_ios(host, &host->ios);
+            }
+            break;
+       case HIF_DEVICE_POWER_UP:
+            if (device->powerConfig == HIF_DEVICE_POWER_CUT) {
+                status = ReinitSDIO(device);
+            }
+            if (status == 0) {
+                status = hifEnableFunc(device, func);
+            }
+            break;
+    } 
+    device->powerConfig = config;
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -PowerStateChangeNotify\n"));
+#endif
+    return status;
+}
+
+int
+HIFConfigureDevice(struct hif_device *device, HIF_DEVICE_CONFIG_OPCODE opcode,
+                   void *config, u32 configLen)
+{
+    u32 count;
+    int status = 0;
+    
+    switch(opcode) {
+        case HIF_DEVICE_GET_MBOX_BLOCK_SIZE:
+            ((u32 *)config)[0] = HIF_MBOX0_BLOCK_SIZE;
+            ((u32 *)config)[1] = HIF_MBOX1_BLOCK_SIZE;
+            ((u32 *)config)[2] = HIF_MBOX2_BLOCK_SIZE;
+            ((u32 *)config)[3] = HIF_MBOX3_BLOCK_SIZE;
+            break;
+
+        case HIF_DEVICE_GET_MBOX_ADDR:
+            for (count = 0; count < 4; count ++) {
+                ((u32 *)config)[count] = HIF_MBOX_START_ADDR(count);
+            }
+            
+            if (configLen >= sizeof(struct hif_device_mbox_info)) {    
+                SetExtendedMboxWindowInfo((u16)device->func->device,
+                                          (struct hif_device_mbox_info *)config);
+            }
+                        
+            break;
+        case HIF_DEVICE_GET_IRQ_PROC_MODE:
+            *((HIF_DEVICE_IRQ_PROCESSING_MODE *)config) = HIF_DEVICE_IRQ_SYNC_ONLY;
+            break;
+       case HIF_CONFIGURE_QUERY_SCATTER_REQUEST_SUPPORT:
+            if (!device->scatter_enabled) {
+                return A_ENOTSUP;    
+            }
+            status = SetupHIFScatterSupport(device, (struct hif_device_scatter_support_info *)config);
+            if (status) {
+                device->scatter_enabled = false;
+            }
+            break; 
+        case HIF_DEVICE_GET_OS_DEVICE:
+                /* pass back a pointer to the SDIO function's "dev" struct */
+            ((struct hif_device_os_device_info *)config)->pOSDevice = &device->func->dev;
+            break; 
+        case HIF_DEVICE_POWER_STATE_CHANGE:
+            status = PowerStateChangeNotify(device, *(HIF_DEVICE_POWER_CHANGE_TYPE *)config);
+            break;
+        default:
+            AR_DEBUG_PRINTF(ATH_DEBUG_WARN,
+                            ("AR6000: Unsupported configuration opcode: %d\n", opcode));
+            status = A_ERROR;
+    }
+
+    return status;
+}
+
+void
+HIFShutDownDevice(struct hif_device *device)
+{
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +HIFShutDownDevice\n"));
+    if (device != NULL) {
+        AR_DEBUG_ASSERT(device->func != NULL);
+    } else {
+            /* since we are unloading the driver anyways, reset all cards in case the SDIO card
+             * is externally powered and we are unloading the SDIO stack.  This avoids the problem when
+             * the SDIO stack is reloaded and attempts are made to re-enumerate a card that is already
+             * enumerated */
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFShutDownDevice, resetting\n"));
+        ResetAllCards();
+
+        /* Unregister with bus driver core */
+        if (registered) {
+            registered = 0;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Unregistering with the bus driver\n"));
+            sdio_unregister_driver(&ath6kl_hifdev_driver);
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("AR6000: Unregistered\n"));
+        }
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -HIFShutDownDevice\n"));
+}
+
+static void
+hifIRQHandler(struct sdio_func *func)
+{
+    int status;
+    struct hif_device *device;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +hifIRQHandler\n"));
+
+    device = ath6kl_get_hifdev(func);
+    atomic_set(&device->irqHandling, 1);
+    /* release the host during ints so we can pick it back up when we process cmds */
+    sdio_release_host(device->func);
+    status = device->htcCallbacks.dsrHandler(device->htcCallbacks.context);
+    sdio_claim_host(device->func);
+    atomic_set(&device->irqHandling, 0);
+    AR_DEBUG_ASSERT(status == 0 || status == A_ECANCELED);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -hifIRQHandler\n"));
+}
+
+/* handle HTC startup via thread*/
+static int startup_task(void *param)
+{
+    struct hif_device *device;
+
+    device = (struct hif_device *)param;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: call HTC from startup_task\n"));
+        /* start  up inform DRV layer */
+    if ((osdrvCallbacks.deviceInsertedHandler(osdrvCallbacks.context,device)) != 0) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device rejected\n"));
+    }
+    return 0;
+}
+
+#if defined(CONFIG_PM)
+static int enable_task(void *param)
+{
+    struct hif_device *device;
+    device = (struct hif_device *)param;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: call  from resume_task\n"));
+
+        /* start  up inform DRV layer */
+    if (device && 
+        device->claimedContext && 
+        osdrvCallbacks.devicePowerChangeHandler &&
+        osdrvCallbacks.devicePowerChangeHandler(device->claimedContext, HIF_DEVICE_POWER_UP) != 0)
+    {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: Device rejected\n"));
+    }
+
+    return 0;
+}
+#endif
+
+void
+HIFAckInterrupt(struct hif_device *device)
+{
+    AR_DEBUG_ASSERT(device != NULL);
+
+    /* Acknowledge our function IRQ */
+}
+
+void
+HIFUnMaskInterrupt(struct hif_device *device)
+{
+    int ret;
+
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFUnMaskInterrupt\n"));
+
+    /* Register the IRQ Handler */
+    sdio_claim_host(device->func);
+    ret = sdio_claim_irq(device->func, hifIRQHandler);
+    sdio_release_host(device->func);
+    AR_DEBUG_ASSERT(ret == 0);
+}
+
+void HIFMaskInterrupt(struct hif_device *device)
+{
+    int ret;
+    AR_DEBUG_ASSERT(device != NULL);
+    AR_DEBUG_ASSERT(device->func != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: HIFMaskInterrupt\n"));
+
+    /* Mask our function IRQ */
+    sdio_claim_host(device->func);
+    while (atomic_read(&device->irqHandling)) {        
+        sdio_release_host(device->func);
+        schedule_timeout(HZ/10);
+        sdio_claim_host(device->func);
+    }
+    ret = sdio_release_irq(device->func);
+    sdio_release_host(device->func);
+    AR_DEBUG_ASSERT(ret == 0);
+}
+
+BUS_REQUEST *hifAllocateBusRequest(struct hif_device *device)
+{
+    BUS_REQUEST *busrequest;
+    unsigned long flag;
+
+    /* Acquire lock */
+    spin_lock_irqsave(&device->lock, flag);
+
+    /* Remove first in list */
+    if((busrequest = device->s_busRequestFreeQueue) != NULL)
+    {
+        device->s_busRequestFreeQueue = busrequest->next;
+    }
+    /* Release lock */
+    spin_unlock_irqrestore(&device->lock, flag);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: hifAllocateBusRequest: 0x%p\n", busrequest));
+    return busrequest;
+}
+
+void
+hifFreeBusRequest(struct hif_device *device, BUS_REQUEST *busrequest)
+{
+    unsigned long flag;
+
+    AR_DEBUG_ASSERT(busrequest != NULL);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: hifFreeBusRequest: 0x%p\n", busrequest));
+    /* Acquire lock */
+    spin_lock_irqsave(&device->lock, flag);
+
+
+    /* Insert first in list */
+    busrequest->next = device->s_busRequestFreeQueue;
+    busrequest->inusenext = NULL;
+    device->s_busRequestFreeQueue = busrequest;
+
+    /* Release lock */
+    spin_unlock_irqrestore(&device->lock, flag);
+}
+
+static int hifDisableFunc(struct hif_device *device, struct sdio_func *func)
+{
+    int ret;
+    int status = 0;
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +hifDisableFunc\n"));
+    device = ath6kl_get_hifdev(func);
+    if (!IS_ERR(device->async_task)) {
+        init_completion(&device->async_completion);
+        device->async_shutdown = 1;
+        up(&device->sem_async);
+        wait_for_completion(&device->async_completion);
+        device->async_task = NULL;
+    }
+    /* Disable the card */
+    sdio_claim_host(device->func);
+    ret = sdio_disable_func(device->func);
+    if (ret) {
+        status = A_ERROR;
+    } 
+
+    if (reset_sdio_on_unload) {
+        /* reset the SDIO interface.  This is useful in automated testing where the card
+         * does not need to be removed at the end of the test.  It is expected that the user will 
+         * also unload/reload the host controller driver to force the bus driver to re-enumerate the slot */
+        AR_DEBUG_PRINTF(ATH_DEBUG_WARN, ("AR6000: reseting SDIO card back to uninitialized state \n"));
+        
+        /* NOTE : sdio_f0_writeb() cannot be used here, that API only allows access
+         *        to undefined registers in the range of: 0xF0-0xFF */
+         
+        ret = Func0_CMD52WriteByte(device->func->card, SDIO_CCCR_ABORT, (1 << 3)); 
+        if (ret) {
+            status = A_ERROR;
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("AR6000: reset failed : %d \n",ret));    
+        }
+    }
+
+    sdio_release_host(device->func);
+
+    if (status == 0) {
+        device->is_disabled = true;
+    }
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -hifDisableFunc\n"));
+
+    return status;
+}
+
+static int hifEnableFunc(struct hif_device *device, struct sdio_func *func)
+{
+    struct task_struct* pTask;
+    const char *taskName = NULL;
+    int (*taskFunc)(void *) = NULL;
+    int ret = 0;
+    
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: +hifEnableFunc\n"));
+    device = ath6kl_get_hifdev(func);
+
+    if (device->is_disabled) {
+       /* enable the SDIO function */
+        sdio_claim_host(func);
+
+        if ((device->id->device & MANUFACTURER_ID_AR6K_BASE_MASK) >= MANUFACTURER_ID_AR6003_BASE) {
+            /* enable 4-bit ASYNC interrupt on AR6003 or later devices */
+            ret = Func0_CMD52WriteByte(func->card, CCCR_SDIO_IRQ_MODE_REG, SDIO_IRQ_MODE_ASYNC_4BIT_IRQ);
+            if (ret) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("AR6000: failed to enable 4-bit ASYNC IRQ mode %d \n",ret));
+                sdio_release_host(func);
+                return ret;
+            }
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: 4-bit ASYNC IRQ mode enabled\n"));
+        }
+        /* give us some time to enable, in ms */
+        func->enable_timeout = 100;
+        ret = sdio_enable_func(func);
+        if (ret) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), Unable to enable AR6K: 0x%X\n",
+                                          __FUNCTION__, ret));
+            sdio_release_host(func);
+            return ret;
+        }
+        ret = sdio_set_block_size(func, HIF_MBOX_BLOCK_SIZE);
+        sdio_release_host(func);
+        if (ret) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), Unable to set block size 0x%x  AR6K: 0x%X\n",
+                                          __FUNCTION__, HIF_MBOX_BLOCK_SIZE, ret));
+            return ret;
+        }
+        device->is_disabled = false;
+        /* create async I/O thread */
+        if (!device->async_task) {
+            device->async_shutdown = 0;
+            device->async_task = kthread_create(async_task,
+                                           (void *)device,
+                                           "AR6K Async");
+           if (IS_ERR(device->async_task)) {
+               AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), to create async task\n", __FUNCTION__));
+                return -ENOMEM;
+           }
+           AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: start async task\n"));
+           wake_up_process(device->async_task );    
+        }
+    }
+
+    if (!device->claimedContext) {
+        taskFunc = startup_task;
+        taskName = "AR6K startup";
+        ret = 0;
+#if defined(CONFIG_PM)
+    } else {
+        taskFunc = enable_task;
+        taskName = "AR6K enable";
+        ret = -ENOMEM;
+#endif /* CONFIG_PM */
+    }
+    /* create resume thread */
+    pTask = kthread_create(taskFunc, (void *)device, taskName);
+    if (IS_ERR(pTask)) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("AR6000: %s(), to create enabel task\n", __FUNCTION__));
+        return -ENOMEM;
+    }
+    wake_up_process(pTask);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: -hifEnableFunc\n"));
+
+    /* task will call the enable func, indicate pending */
+    return ret;
+}
+
+/*
+ * This should be moved to AR6K HTC layer.
+ */
+int hifWaitForPendingRecv(struct hif_device *device)
+{
+    s32 cnt = 10;
+    u8 host_int_status;
+    int status = 0;
+
+    do {                            
+        while (atomic_read(&device->irqHandling)) {
+                /* wait until irq handler finished all the jobs */
+                        schedule_timeout(HZ/10);
+            }
+                /* check if there is any pending irq due to force done */
+                host_int_status = 0;
+            status = HIFReadWrite(device, HOST_INT_STATUS_ADDRESS,
+                                    (u8 *)&host_int_status, sizeof(host_int_status),
+                                     HIF_RD_SYNC_BYTE_INC, NULL);
+            host_int_status = !status ? (host_int_status & (1 << 0)) : 0;
+                if (host_int_status) {
+                schedule(); /* schedule for next dsrHandler */
+                }
+        } while (host_int_status && --cnt > 0);
+
+    if (host_int_status && cnt == 0) {
+         AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, 
+                            ("AR6000: %s(), Unable clear up pending IRQ before the system suspended\n", __FUNCTION__));
+     }
+
+    return 0;
+}
+    
+static void
+delHifDevice(struct hif_device * device)
+{
+    AR_DEBUG_ASSERT(device!= NULL);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("AR6000: delHifDevice; 0x%p\n", device));
+    kfree(device->dma_buffer);
+    kfree(device);
+}
+
+static void ResetAllCards(void)
+{
+}
+
+void HIFClaimDevice(struct hif_device  *device, void *context)
+{
+    device->claimedContext = context;
+}
+
+void HIFReleaseDevice(struct hif_device  *device)
+{
+    device->claimedContext = NULL;
+}
+
+int HIFAttachHTC(struct hif_device *device, HTC_CALLBACKS *callbacks)
+{
+    if (device->htcCallbacks.context != NULL) {
+            /* already in use! */
+        return A_ERROR;
+    }
+    device->htcCallbacks = *callbacks;
+    return 0;
+}
+
+void HIFDetachHTC(struct hif_device *device)
+{
+    A_MEMZERO(&device->htcCallbacks,sizeof(device->htcCallbacks));
+}
+
+#define SDIO_SET_CMD52_ARG(arg,rw,func,raw,address,writedata) \
+    (arg) = (((rw) & 1) << 31)           | \
+            (((func) & 0x7) << 28)       | \
+            (((raw) & 1) << 27)          | \
+            (1 << 26)                    | \
+            (((address) & 0x1FFFF) << 9) | \
+            (1 << 8)                     | \
+            ((writedata) & 0xFF)
+            
+#define SDIO_SET_CMD52_READ_ARG(arg,func,address) \
+    SDIO_SET_CMD52_ARG(arg,0,(func),0,address,0x00)
+#define SDIO_SET_CMD52_WRITE_ARG(arg,func,address,value) \
+    SDIO_SET_CMD52_ARG(arg,1,(func),0,address,value)
+    
+static int Func0_CMD52WriteByte(struct mmc_card *card, unsigned int address, unsigned char byte)
+{
+    struct mmc_command ioCmd;
+    unsigned long      arg;
+    
+    memset(&ioCmd,0,sizeof(ioCmd));
+    SDIO_SET_CMD52_WRITE_ARG(arg,0,address,byte);
+    ioCmd.opcode = SD_IO_RW_DIRECT;
+    ioCmd.arg = arg;
+    ioCmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
+    
+    return mmc_wait_for_cmd(card->host, &ioCmd, 0);
+}
+
+static int Func0_CMD52ReadByte(struct mmc_card *card, unsigned int address, unsigned char *byte)
+{
+    struct mmc_command ioCmd;
+    unsigned long      arg;
+    s32 err;
+    
+    memset(&ioCmd,0,sizeof(ioCmd));
+    SDIO_SET_CMD52_READ_ARG(arg,0,address);
+    ioCmd.opcode = SD_IO_RW_DIRECT;
+    ioCmd.arg = arg;
+    ioCmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
+
+    err = mmc_wait_for_cmd(card->host, &ioCmd, 0);
+
+    if ((!err) && (byte)) {
+        *byte =  ioCmd.resp[0] & 0xFF;
+    }
+
+    return err;
+}
diff --git a/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c b/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c
new file mode 100644
index 00000000000..7516d913dab
--- /dev/null
+++ b/drivers/staging/ath6kl/hif/sdio/linux_sdio/src/hif_scatter.c
@@ -0,0 +1,393 @@
+//------------------------------------------------------------------------------
+// Copyright (c) 2009-2010 Atheros Corporation.  All rights reserved.
+// 
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+//
+//------------------------------------------------------------------------------
+//==============================================================================
+// HIF scatter implementation
+//
+// Author(s): ="Atheros"
+//==============================================================================
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+#include <linux/mmc/sdio.h>
+#include <linux/kthread.h>
+#include "hif_internal.h"
+#define ATH_MODULE_NAME hif
+#include "a_debug.h"
+
+#ifdef HIF_LINUX_MMC_SCATTER_SUPPORT
+
+#define _CMD53_ARG_READ          0
+#define _CMD53_ARG_WRITE         1
+#define _CMD53_ARG_BLOCK_BASIS   1 
+#define _CMD53_ARG_FIXED_ADDRESS 0
+#define _CMD53_ARG_INCR_ADDRESS  1
+
+#define SDIO_SET_CMD53_ARG(arg,rw,func,mode,opcode,address,bytes_blocks) \
+    (arg) = (((rw) & 1) << 31)                  | \
+            (((func) & 0x7) << 28)              | \
+            (((mode) & 1) << 27)                | \
+            (((opcode) & 1) << 26)              | \
+            (((address) & 0x1FFFF) << 9)        | \
+            ((bytes_blocks) & 0x1FF)
+            
+static void FreeScatterReq(struct hif_device *device, struct hif_scatter_req *pReq)
+{   
+    unsigned long flag;
+
+    spin_lock_irqsave(&device->lock, flag);
+
+    DL_ListInsertTail(&device->ScatterReqHead, &pReq->ListLink);
+    
+    spin_unlock_irqrestore(&device->lock, flag);
+        
+}
+
+static struct hif_scatter_req *AllocScatterReq(struct hif_device *device) 
+{
+    struct dl_list       *pItem; 
+    unsigned long flag;
+
+    spin_lock_irqsave(&device->lock, flag);
+    
+    pItem = DL_ListRemoveItemFromHead(&device->ScatterReqHead);
+    
+    spin_unlock_irqrestore(&device->lock, flag);
+    
+    if (pItem != NULL) {
+        return A_CONTAINING_STRUCT(pItem, struct hif_scatter_req, ListLink);
+    }
+    
+    return NULL;   
+}
+
+    /* called by async task to perform the operation synchronously using direct MMC APIs  */
+int DoHifReadWriteScatter(struct hif_device *device, BUS_REQUEST *busrequest)
+{
+    int                     i;
+    u8 rw;
+    u8 opcode;
+    struct mmc_request      mmcreq;
+    struct mmc_command      cmd;
+    struct mmc_data         data;
+    struct hif_scatter_req_priv   *pReqPriv;   
+    struct hif_scatter_req        *pReq;       
+    int                status = 0;
+    struct                  scatterlist *pSg;
+    
+    pReqPriv = busrequest->pScatterReq;
+    
+    A_ASSERT(pReqPriv != NULL);
+    
+    pReq = pReqPriv->pHifScatterReq;
+    
+    memset(&mmcreq, 0, sizeof(struct mmc_request));
+    memset(&cmd, 0, sizeof(struct mmc_command));
+    memset(&data, 0, sizeof(struct mmc_data));
+       
+    data.blksz = HIF_MBOX_BLOCK_SIZE;
+    data.blocks = pReq->TotalLength / HIF_MBOX_BLOCK_SIZE;
+                        
+    AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: (%s) Address: 0x%X, (BlockLen: %d, BlockCount: %d) , (tot:%d,sg:%d)\n",
+              (pReq->Request & HIF_WRITE) ? "WRITE":"READ", pReq->Address, data.blksz, data.blocks,
+              pReq->TotalLength,pReq->ValidScatterEntries));
+         
+    if (pReq->Request  & HIF_WRITE) {
+        rw = _CMD53_ARG_WRITE;
+        data.flags = MMC_DATA_WRITE;
+    } else {
+        rw = _CMD53_ARG_READ;
+        data.flags = MMC_DATA_READ;
+    }
+
+    if (pReq->Request & HIF_FIXED_ADDRESS) {
+        opcode = _CMD53_ARG_FIXED_ADDRESS;
+    } else {
+        opcode = _CMD53_ARG_INCR_ADDRESS;
+    }
+    
+        /* fill SG entries */
+    pSg = pReqPriv->sgentries;   
+    sg_init_table(pSg, pReq->ValidScatterEntries); 
+          
+        /* assemble SG list */   
+    for (i = 0 ; i < pReq->ValidScatterEntries ; i++, pSg++) {
+            /* setup each sg entry */
+        if ((unsigned long)pReq->ScatterList[i].pBuffer & 0x3) {
+                /* note some scatter engines can handle unaligned buffers, print this
+                 * as informational only */
+            AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER,
+                            ("HIF: (%s) Scatter Buffer is unaligned 0x%lx\n",
+                            pReq->Request & HIF_WRITE ? "WRITE":"READ",
+                            (unsigned long)pReq->ScatterList[i].pBuffer)); 
+        }
+        
+        AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("  %d:  Addr:0x%lX, Len:%d \n",
+            i,(unsigned long)pReq->ScatterList[i].pBuffer,pReq->ScatterList[i].Length));
+            
+        sg_set_buf(pSg, pReq->ScatterList[i].pBuffer, pReq->ScatterList[i].Length);
+    }
+        /* set scatter-gather table for request */
+    data.sg = pReqPriv->sgentries;
+    data.sg_len = pReq->ValidScatterEntries;
+        /* set command argument */    
+    SDIO_SET_CMD53_ARG(cmd.arg, 
+                       rw, 
+                       device->func->num, 
+                       _CMD53_ARG_BLOCK_BASIS, 
+                       opcode,  
+                       pReq->Address,
+                       data.blocks);  
+                       
+    cmd.opcode = SD_IO_RW_EXTENDED;
+    cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
+    
+    mmcreq.cmd = &cmd;
+    mmcreq.data = &data;
+    
+    mmc_set_data_timeout(&data, device->func->card);    
+        /* synchronous call to process request */
+    mmc_wait_for_req(device->func->card->host, &mmcreq);
+ 
+    if (cmd.error) {
+        status = A_ERROR;   
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: cmd error: %d \n",cmd.error));
+    }
+               
+    if (data.error) {
+        status = A_ERROR;
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: data error: %d \n",data.error));   
+    }
+
+    if (status) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF-SCATTER: FAILED!!! (%s) Address: 0x%X, Block mode (BlockLen: %d, BlockCount: %d)\n",
+              (pReq->Request & HIF_WRITE) ? "WRITE":"READ",pReq->Address, data.blksz, data.blocks));        
+    }
+    
+        /* set completion status, fail or success */
+    pReq->CompletionStatus = status;
+    
+    if (pReq->Request & HIF_ASYNCHRONOUS) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: async_task completion routine req: 0x%lX (%d)\n",(unsigned long)busrequest, status));
+            /* complete the request */
+        A_ASSERT(pReq->CompletionRoutine != NULL);
+        pReq->CompletionRoutine(pReq);
+    } else {
+        AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER async_task upping busrequest : 0x%lX (%d)\n", (unsigned long)busrequest,status));
+            /* signal wait */
+        up(&busrequest->sem_req);
+    }
+                                                               
+    return status;   
+}
+
+    /* callback to issue a read-write scatter request */
+static int HifReadWriteScatter(struct hif_device *device, struct hif_scatter_req *pReq)
+{
+    int             status = A_EINVAL;
+    u32 request = pReq->Request;
+    struct hif_scatter_req_priv *pReqPriv = (struct hif_scatter_req_priv *)pReq->HIFPrivate[0];
+    
+    do {
+        
+        A_ASSERT(pReqPriv != NULL);
+        
+        AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: total len: %d Scatter Entries: %d\n", 
+                            pReq->TotalLength, pReq->ValidScatterEntries));
+        
+        if (!(request & HIF_EXTENDED_IO)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("HIF-SCATTER: Invalid command type: 0x%08x\n", request));
+            break;
+        }
+        
+        if (!(request & (HIF_SYNCHRONOUS | HIF_ASYNCHRONOUS))) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("HIF-SCATTER: Invalid execution mode: 0x%08x\n", request));
+            break;
+        }
+        
+        if (!(request & HIF_BLOCK_BASIS)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("HIF-SCATTER: Invalid data mode: 0x%08x\n", request));
+            break;   
+        }
+        
+        if (pReq->TotalLength > MAX_SCATTER_REQ_TRANSFER_SIZE) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("HIF-SCATTER: Invalid length: %d \n", pReq->TotalLength));
+            break;          
+        }
+        
+        if (pReq->TotalLength == 0) {
+            A_ASSERT(false);
+            break;    
+        }
+        
+            /* add bus request to the async list for the async I/O thread to process */
+        AddToAsyncList(device, pReqPriv->busrequest);
+
+        if (request & HIF_SYNCHRONOUS) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued sync req: 0x%lX\n", (unsigned long)pReqPriv->busrequest));
+            /* signal thread and wait */
+            up(&device->sem_async);
+            if (down_interruptible(&pReqPriv->busrequest->sem_req) != 0) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,("HIF-SCATTER: interrupted! \n"));
+                /* interrupted, exit */
+                status = A_ERROR;
+                break;
+            } else {
+                status = pReq->CompletionStatus;
+            }
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_SCATTER, ("HIF-SCATTER: queued async req: 0x%lX\n", (unsigned long)pReqPriv->busrequest));
+                /* wake thread, it will process and then take care of the async callback */
+            up(&device->sem_async);
+            status = 0;
+        }           
+       
+    } while (false);
+
+    if (status && (request & HIF_ASYNCHRONOUS)) {
+        pReq->CompletionStatus = status;
+        pReq->CompletionRoutine(pReq);
+        status = 0;
+    }
+        
+    return status;  
+}
+
+    /* setup of HIF scatter resources */
+int SetupHIFScatterSupport(struct hif_device *device, struct hif_device_scatter_support_info *pInfo)
+{
+    int              status = A_ERROR;
+    int                   i;
+    struct hif_scatter_req_priv *pReqPriv;
+    BUS_REQUEST          *busrequest;
+        
+    do {
+        
+            /* check if host supports scatter requests and it meets our requirements */
+        if (device->func->card->host->max_segs < MAX_SCATTER_ENTRIES_PER_REQ) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : host only supports scatter of : %d entries, need: %d \n",
+                    device->func->card->host->max_segs, MAX_SCATTER_ENTRIES_PER_REQ));
+            status = A_ENOTSUP;
+            break;    
+        }
+                    
+        AR_DEBUG_PRINTF(ATH_DEBUG_ANY,("HIF-SCATTER Enabled: max scatter req : %d entries: %d \n",
+                MAX_SCATTER_REQUESTS, MAX_SCATTER_ENTRIES_PER_REQ)); 
+        
+        for (i = 0; i < MAX_SCATTER_REQUESTS; i++) {    
+                /* allocate the private request blob */
+            pReqPriv = (struct hif_scatter_req_priv *)A_MALLOC(sizeof(struct hif_scatter_req_priv));
+            if (NULL == pReqPriv) {
+                break;    
+            }
+            A_MEMZERO(pReqPriv, sizeof(struct hif_scatter_req_priv));
+                /* save the device instance*/
+            pReqPriv->device = device;      
+                /* allocate the scatter request */
+            pReqPriv->pHifScatterReq = (struct hif_scatter_req *)A_MALLOC(sizeof(struct hif_scatter_req) + 
+                                         (MAX_SCATTER_ENTRIES_PER_REQ - 1) * (sizeof(struct hif_scatter_item))); 
+           
+            if (NULL == pReqPriv->pHifScatterReq) {
+                kfree(pReqPriv);
+                break;      
+            }           
+                /* just zero the main part of the scatter request */
+            A_MEMZERO(pReqPriv->pHifScatterReq, sizeof(struct hif_scatter_req));
+                /* back pointer to the private struct */
+            pReqPriv->pHifScatterReq->HIFPrivate[0] = pReqPriv;
+                /* allocate a bus request for this scatter request */
+            busrequest = hifAllocateBusRequest(device);
+            if (NULL == busrequest) {
+                kfree(pReqPriv->pHifScatterReq);
+                kfree(pReqPriv);
+                break;    
+            }
+                /* assign the scatter request to this bus request */
+            busrequest->pScatterReq = pReqPriv;
+                /* point back to the request */
+            pReqPriv->busrequest = busrequest;                           
+                /* add it to the scatter pool */
+            FreeScatterReq(device,pReqPriv->pHifScatterReq);
+        }
+        
+        if (i != MAX_SCATTER_REQUESTS) {
+            status = A_NO_MEMORY;
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("HIF-SCATTER : failed to alloc scatter resources !\n"));
+            break;    
+        }
+        
+            /* set scatter function pointers */
+        pInfo->pAllocateReqFunc = AllocScatterReq;
+        pInfo->pFreeReqFunc = FreeScatterReq;
+        pInfo->pReadWriteScatterFunc = HifReadWriteScatter;   
+        pInfo->MaxScatterEntries = MAX_SCATTER_ENTRIES_PER_REQ;
+        pInfo->MaxTransferSizePerScatterReq = MAX_SCATTER_REQ_TRANSFER_SIZE;
+     
+        status = 0;
+        
+    } while (false);
+    
+    if (status) {
+        CleanupHIFScatterResources(device);   
+    }
+    
+    return status;
+}
+
+    /* clean up scatter support */
+void CleanupHIFScatterResources(struct hif_device *device)
+{
+    struct hif_scatter_req_priv    *pReqPriv;
+    struct hif_scatter_req         *pReq;
+    
+        /* empty the free list */
+        
+    while (1) {
+        
+        pReq = AllocScatterReq(device);
+                
+        if (NULL == pReq) {
+            break;    
+        }   
+        
+        pReqPriv = (struct hif_scatter_req_priv *)pReq->HIFPrivate[0];
+        A_ASSERT(pReqPriv != NULL);
+        
+        if (pReqPriv->busrequest != NULL) {
+            pReqPriv->busrequest->pScatterReq = NULL;
+                /* free bus request */
+            hifFreeBusRequest(device, pReqPriv->busrequest);
+            pReqPriv->busrequest = NULL;
+        }
+        
+        if (pReqPriv->pHifScatterReq != NULL) {
+            kfree(pReqPriv->pHifScatterReq);   
+            pReqPriv->pHifScatterReq = NULL; 
+        }
+                
+        kfree(pReqPriv);       
+    }
+}
+
+#endif // HIF_LINUX_MMC_SCATTER_SUPPORT